[happytoexplain]

>You cannot claim the moral high-ground after this.

Who is "you"? An individual decrying the trolling of suicide victims while themselves trolling COVID victims? Then yes, you're right. But "the alt-right" is not a single person, nor is whatever their polar opposite is. This fallacy is at the heart of virtually all political bitterness. I do believe when something horrible happens and is highly correlated with a political group, leaders of that group should denounce it, but when something horrible happens in group A and a similar horrible thing happens in group B, that doesn't inherently mean that anybody is a hypocrite. It just means that horrible people are members of both groups.